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Overexpression of Grapevine VvIAA18 Gene Enhanced Salt Tolerance in Tobacco

School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huai’an 223003, China
Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China
Authors to whom correspondence should be addressed.
These authors contribute equally to this work.
Int. J. Mol. Sci. 2020, 21(4), 1323;
Received: 11 January 2020 / Revised: 11 February 2020 / Accepted: 12 February 2020 / Published: 15 February 2020
(This article belongs to the Section Molecular Plant Sciences)
In plants, auxin/indoleacetic acid (Aux/IAA) proteins are transcriptional regulators that regulate developmental process and responses to phytohormones and stress treatments. However, the regulatory functions of the Vitis vinifera L. (grapevine) Aux/IAA transcription factor gene VvIAA18 have not been reported. In this study, the VvIAA18 gene was successfully cloned from grapevine. Subcellular localization analysis in onion epidermal cells indicated that VvIAA18 was localized to the nucleus. Expression analysis in yeast showed that the full length of VvIAA18 exhibited transcriptional activation. Salt tolerance in transgenic tobacco plants and Escherichia. coli was significantly enhanced by VvIAA18 overexpression. Real-time quantitative PCR analysis showed that overexpression of VvIAA18 up-regulated the salt stress-responsive genes, including pyrroline-5-carboxylate synthase (NtP5CS), late embryogenesis abundant protein (NtLEA5), superoxide dismutase (NtSOD), and peroxidase (NtPOD) genes, under salt stress. Enzymatic analyses found that the transgenic plants had higher SOD and POD activities under salt stress. Meanwhile, component analysis showed that the content of proline in transgenic plants increased significantly, while the content of hydrogen peroxide (H2O2) and malondialdehyde (MDA) decreased significantly. Based on the above results, the VvIAA18 gene is related to improving the salt tolerance of transgenic tobacco plants. The VvIAA18 gene has the potential to be applied to enhance plant tolerance to abiotic stress. View Full-Text
Keywords: Escherichia coli; grapevine; salt tolerance; tobacco; VvIAA18 Escherichia coli; grapevine; salt tolerance; tobacco; VvIAA18
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Li, W.; Dang, C.; Ye, Y.; Wang, Z.; Hu, L.; Zhang, F.; Zhang, Y.; Qian, X.; Shi, J.; Guo, Y.; Zhou, Q.; Wang, T.; Chen, X.; Wang, F. Overexpression of Grapevine VvIAA18 Gene Enhanced Salt Tolerance in Tobacco. Int. J. Mol. Sci. 2020, 21, 1323.

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